The Blackphone, supposedly the most secure Android handset around when it comes to safeguarding the privacy of the user, is soon going to get even better, as the company behind it will release a special app store for secure applications for the handset. The company on Tuesday revealed that Blackphone will receive a major operating system update in early 2015, which will bring several new features to PrivatOS.

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Note: I hope the Guardian ROM folks can match this effort with their own special app store for its own secure applications tied to its handset when it delivers its first models to the market and thensome.

I am speculating and am in no way affiliated with GuardianROM but I don't think they will launch their own app store, at least not initially. It requires a lot of money and resources to maintain an app store. GuardianROM will provide a great scaffolding for a secure app store to flourish but with the talk of launching a "Guardian phone" and they amount of work required to create the ROM itself I would find it unlikely they would have the time to launch an app store. My guess would be F-Droid will be the best choice for open source apps for this ROM, or just side loading apps. There is unarguably much needed apps that are still only available on the Google Play Store like Redphone and Textsecure. Building from the source code is the most secure option for these apps.